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Vertical power flow forecast with LSTMs using regular training updatestrategies

能源与人工智能(英文) 2022年第2期8卷 92-99页

作者： Katharina Brauns Christoph Scholz Alexander Schultz AndréBaier dominik jost Fraunhofer IEE Königstor 5934119 KasselGermany

The strong growth of renewable energy sources as well as the increasing amount of volatile energy consumptionis leading to major challenges in the electrical grid. In order to ensure safety and reliability in the electricitygrid, a high quality of power flow forecasts for the next few hours are needed. In this paper we investigateforecasts of the vertical power flow at transformer between the medium and high voltage grid. Forecastingthe vertical power flow is challenging due to constantly changing characteristics of the power flow at thetransformer. We present a novel approach to deal with these challenges. For the multi step time series forecastsa Long-Short Term Memory (LSTM) is used. In our presented approach an update process where the model isretrained regularly is investigated and compared to baseline models. The model is retrained as soon as asufficient amount of new measurements are available. We show that this retraining mostly captures changesin the characteristic of the transformer that the model has not yet seen in the past and therefore cannot bepredicted by the model without an update process. To give more weight to recent data, we examined differentstrategies in terms of the number of epochs and the learning rate. We show that our new approach significantlyoutperforms the investigated baseline models. On average, we achieved an improvement of about 8% with theregular update process compared to the approach without update process.

关键词： Vertical power flow Forecasting LSTM

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Motility patterns of ex vivo intestine segments depend on perfusion mode

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World Journal of Gastroenterology 2014年第48期20卷 18216-18227页

作者： dominik Schreiber Viktor jost Michael Bischof Kristina Seebach Wim JEP Lammers Rees Douglas Karl-Herbert Schafer Enteric Nervous System GroupUniversity of Applied Sciences Kaiserslautern Zweibrücke 66482 Germany College of Medicine and Health Sciences United Arab Emirates University Al-Ain 17666 United Arab Emirates Aqix Limited Imperial College Incubator London SW7 2AZ United Kingdom

AIM:To evaluate and characterize motility patterns from small intestinal gut segments depending on different perfusion media and ***:Experiments were carried out in a custom designed perfusion chamber system to validate and standardise the perfusion technique *** perfusion chamber was built with a transparent front wall allowing for optical motility recordings and a custom made fastener to hold the intestinal *** with different perfusion and storage media combined with different luminal pressures were carried out to evaluate the effects on rat small intestine *** tools which enable thevisualization and characterization of intestinal motility in response to different stimuli were used to evaluate the videotaped *** data collected was presented in so called heatmaps thus providing a concise overview of form and strength of contractility ***,the effect of different storage media on tissue quality was *** stainings were used to compare tissue quality depending on storage and perfusion ***:Intestinal motility is characterized by different repetitive motility patterns,depending on the actual situation of the *** motility patterns could be recorded and characterized depending on the perfusion pressure and media *** were able to describe at least three different repetitive patterns of intestinal motility in *** with an oral,anal and oro-anal propagation direction could be *** type of pattern finalized its movement with or without a subsequent distension of the *** patterns could clearly be distinguished in heatmap *** undirected motility could be *** quantity of the different patterns varies and is highly dependent on the perfusion medium *** preservation varies depending on the perfusion medium utilized,therefore media with a simple composition as Tyrode solution can only be recom

关键词： Small intestine Motility Organ perfusion Pharmacological testing Visualization

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